Electromagnetic wave back absorption equipment of 5.8 G frequency radar and application method

Abstract

An electromagnetic wave back absorption device of a 5.8 G frequency radar belongs to the technical field of radar detection and comprises an electromagnetic generator, a cavity, a magnetic fluid and an electromagnetic controller. Wave guide plates are vertically distributed at the front end and the rear end in the cavity respectively, the magnetic liquid is located in the cavity in a sealed mode, and ferrite particles are mixed in the magnetic liquid. The multiple sets of electromagnetic generators are installed on the outer side of the cavity. The application method of the electromagnetic wave back absorption equipment of the 5.8 G frequency radar comprises three steps. According to the invention, a closed control loop is formed by monitoring back radar waves and the electromagnetic controller, and the motion states of the magnetic liquid in the absorption cavity and the ferrite particles are controlled at high frequency through the double-row independent electromagnetic generators in multiple directions, so that different levels of radar wave absorption effects are achieved; and finally, all back radar waves are absorbed, and the radar waves are transferred to the upper part of the cavity for diffusion through high-frequency control magnetic liquid movement, so that the problem of mutual interference between transmitting and receiving of a radar transmitter when a 5.8 G frequency radar matrix works is solved.

Description

Technical Field

[0001] The present invention relates to the field of radar detection technology, and in particular to an electromagnetic wave back-absorbing device for a 5.8G frequency radar and an application method thereof. Background Art

[0002] 5.8G frequency radar is a radar module that works in the 5.8GHz frequency band. It has the advantages of high sensitivity and long-distance sensing. It is mainly used for distance and displacement measurement. In addition, 5.8GHz radar sensing modules are also widely used in smart home, Internet of Things and smart lighting, such as induction bulbs, fluorescent tubes, ceiling lamps and other lighting products. The main principle of the 5.8GHz radar module is to use electromagnetic waves to detect targets. It transmits electromagnetic waves and receives their echoes to obtain information such as the distance, speed, direction and height between the target and the radar. Specifically, when the target object (such as a person or an object) moves, the frequency of the electromagnetic wave reflected by it will change. This change is received and processed by the radar of the radar module, so that the detection and positioning of the target can be achieved.

[0003] Although the existing 5.8G frequency radar has met the needs of practical applications to a certain extent, it is limited by the structure and still has the following technical problems. Specifically, during the normal operation of the existing 5.8G frequency radar, the radar waves emitted by the transmitter may not only propagate forward according to the established design angle, but may also penetrate the radar transmitter's own circuit board and shell and spread to the back (rear side). When working alone, the back-spreading radar waves will not affect the radar transmitter with a reasonable antenna design. However, when the radar transmitters of multiple 5.8G frequency radars are used to work in a matrix state, they will receive the back-spreading radar waves emitted by the opposite 5.8G frequency radar's larger radar transmitter, which will affect the working state (radar signal attenuation, resulting in signal distortion or misjudgment, affecting the radar's detection distance and accuracy). Summary of the invention

[0004] In order to overcome the drawbacks of the existing 5.8G frequency radar due to technical limitations as described in the background, the present invention provides an absorption guide module added to the back of the radar wave transmitter of the 5.8G frequency radar body, which can absorb all the radar waves on the back and transfer the radar waves to the top through high-frequency control of magnetic fluid movement to diffuse, thereby solving the problem of mutual interference between the transmission and reception of radar transmitters when multiple 5.8G frequency radar matrices are working, and providing a 5.8G frequency radar electromagnetic wave back-absorbing device and application method, which provides strong technical support for the reliable and effective application of 5.8G frequency radars.

[0005] The technical solution adopted by the present invention to solve its technical problem is: A 5.8G frequency radar electromagnetic wave back absorption device comprises a DC frequency conversion power supply module, an electromagnetic generator, a cavity, a magnetic fluid, and an electromagnetic controller; waveguide plates are vertically distributed at the front and rear ends of the cavity, respectively, the magnetic fluid seal is located in the cavity, and ferrite particles are mixed in the magnetic fluid; there are multiple sets of electromagnetic generators, and the multiple sets of electromagnetic generators are respectively installed on the left, right, upper and lower parts of the outer side of the cavity, the power output end of the DC frequency conversion power supply module is electrically connected to the power input end of the electromagnetic controller, and the power output end of the electromagnetic controller is electrically connected to the power input ends of the multiple sets of electromagnetic generators; the waveguide plate is cylindrical, and the waveguide plates at the front and rear ends of the cavity are spaced apart from the upper end and the lower end of the cavity respectively; the cavity is made of metal, the 5.8G frequency radar module is fixedly installed at the outer front side of the cavity, and the DC frequency conversion power supply module and the electromagnetic controller are installed in a component box.

[0006] Furthermore, the electromagnetic generator comprises an electromagnetic generator core and an electromagnetic transmitter winding coil, a plurality of turns of the electromagnetic transmitter winding coil are wrapped around the outer end of the electromagnetic generator core, and a protective shell is sealed outside the electromagnetic transmitter winding coil.

[0007] Furthermore, each coil of the multiple sets of electromagnetic generators has an independent control module based on a single chip microcomputer, and each control module is controlled by the single chip microcomputer to achieve the purpose of controlling the electromagnetic generator to generate different magnetic field strengths and directions.

[0008] Furthermore, two sets of electromagnetic generators are installed on the left and right sides and the upper and lower sides of the outer side of the cavity respectively, and the two sets of electromagnetic generators are spaced apart from each other.

[0009] Furthermore, the magnetic fluid fills the cavity.

[0010] Furthermore, the waveguide plate is arc-shaped and made of graphene.

[0011] The invention discloses an application method of an electromagnetic wave back-absorbing device for a 5.8G frequency radar, comprising the following steps: S1: when the 5.8G frequency radar is working, its transmitter emits radar waves; S2: a DC frequency conversion power supply module supplies power to an electromagnetic controller, and the electromagnetic controller controls high-frequency vibration of dual-row independent electromagnetic generators in four directions, thereby controlling magnetic fluid and ferrite particles inside a cavity to be in a vibrating and moving state, so as to achieve different levels of radar wave absorption effects reflected by 5.8G frequency radar modules; and S3: the radar electromagnetic waves are absorbed by the ferrite in the magnetic fluid and bypass a waveguide plate, and then guided to the upper part of the cavity, so as to avoid interference with radar waves emitted by transmitters of other 5.8G frequency radars.

[0012] Furthermore, in step S2, when the power output by the electromagnetic controller is greater, the output power of the electromagnetic generator is greater, and the vibration intensity of the magnetic fluid and ferrite particles is greater, and vice versa, the vibration intensity is smaller.

[0013] Furthermore, in step S3, the absorbed radar waves and the movement of the magnetic fluid are controlled by high frequency, and the radar waves are transferred to the top of the cavity for diffusion, thereby solving the mutual interference problem when the multi-radar transmitter matrix is ​​working.

[0014] The beneficial effect of the present invention is as follows: the present invention adds an absorption guide module on the back of the radar wave transmitter of the 5.8G frequency radar body, forms a closed control loop through the monitoring of the back-facing radar wave and the electromagnetic controller, achieves different levels of radar wave absorption effects through the dual-row independent electromagnetic generators in multiple directions, high-frequency control of the magnetic fluid inside the absorption cavity, and the motion state of the ferrite particles, and finally absorbs all the back radar waves and transfers the radar waves to the top of the cavity through high-frequency control of the magnetic fluid movement, thereby solving the problem of mutual interference between the transmission and reception of the radar transmitter when the multi-5.8G frequency radar matrix is ​​working, and provides strong technical support for the reliable and effective application of the 5.8G frequency radar. In summary, the present invention has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the top plan structure between the present invention and the 5.8G frequency radar.

[0018] Figure 3 It is a schematic diagram of the side cross-sectional structure between the present invention and a 5.8G frequency radar.

[0019] Figure 4 It is a schematic diagram of the partially enlarged structure of the electromagnetic generator of the present invention.

[0020] Figure 5 It is a schematic diagram of the working effect between the present invention and a single 5.8G frequency radar.

[0021] Figure 6 It is a schematic diagram of an application scenario of a matrix radar composed of the present invention and multiple 5.8G frequency radars. DETAILED DESCRIPTION

[0022] Figure 1 , 2, 3, 4, 5, and 6, an electromagnetic wave back-absorbing device for a 5.8G frequency radar includes a DC variable frequency power supply module (not shown in the figure), an electromagnetic generator 1, a cavity 2, a magnetic fluid 3, and an electromagnetic controller (not shown in the figure); waveguide plates 21 are vertically distributed at the front and rear ends of the middle part of the cavity 2, the magnetic fluid 3 is sealed in the cavity 2, and ferrite particles 4 are mixed in the magnetic fluid 3; the electromagnetic generator 1 has eight sets, and the eight sets of electromagnetic generators 1 are respectively installed on the left, right, upper and lower parts of the outer side of the cavity 2, and the power output end and the power supply end of the DC variable frequency power supply module are connected to the power supply module 2. The power input end of the magnetic controller is connected via a wire, the power output end of the electromagnetic controller and the power input end of the eight sets of electromagnetic generators 1 are connected via a wire, and the power input end of the DC frequency conversion power supply module and the two levels of the AC 220V power supply are respectively connected via wires; the waveguide plate 21 is made of cylindrical metal material, and the waveguide plates 21 at the front and rear ends of the cavity 2 are respectively spaced apart from the upper end and the lower end of the cavity; the cavity 2 is made of metal, the 5.8G frequency radar module 5 is fixedly installed at the outer front end of the cavity, and the DC frequency conversion power supply module and the electromagnetic controller are installed in the component box.

[0023] Figure 1 , 2 As shown in , 3, 4, 5, and 6, the electromagnetic generator includes an electromagnetic generator core 101 and an electromagnetic transmitter winding coil 102. Several turns of the electromagnetic transmitter winding coil 102 are wrapped around the outer end of the electromagnetic generator core 101, and a sealed plastic protective shell is installed outside the electromagnetic transmitter winding coil. Each coil of the eight sets of electromagnetic generators has an independent control module based on a single-chip microcomputer, and each control module is controlled by a single-chip microcomputer to achieve the control purpose of controlling the electromagnetic generator to generate different magnetic field strengths and directions. Two sets of electromagnetic generators 1 are installed on the left and right sides and the upper and lower parts of the outer side of the cavity 2, and the two sets of electromagnetic generators 1 are spaced a certain distance from front to back. The magnetic fluid 3 fills the cavity 2. The waveguide plate 21 is arc-shaped and is made of graphene.

[0024] Figure 1 , 2As shown in Figures 3, 4, 5, and 6, an application method of an electromagnetic wave back-absorbing device for a 5.8G frequency radar includes the following steps: (1): the DC frequency conversion power supply module is powered to output a DC pulse width modulation power supply signal to the power input terminal of the electromagnetic controller. At the same time, the 5.8G frequency radar works and its transmitter emits radar waves forward. (2) The DC frequency conversion power supply module supplies power to the electromagnetic controller, and the electromagnetic controller controls the dual-row independent electromagnetic generators 2 in four directions to be powered to vibrate at high frequency, thereby controlling the magnetic fluid 3 and ferrite particles 4 inside the cavity 2 to be in a vibrating and moving state, achieving different levels of radar wave absorption effects reflected by the 5.8G frequency radar module; the greater the power output of the electromagnetic controller, the greater the output power of the electromagnetic generator, the greater the vibration intensity of the magnetic fluid and the ferrite particles, and vice versa, the smaller the vibration intensity. (3) The radar electromagnetic wave is absorbed by the ferrite in the magnetic fluid and bypasses the waveguide plate and is then guided to the upper part of the cavity (the waveguide plate is arc-shaped and the graphene material has excellent electromagnetic wave absorption performance), thereby avoiding interference with the radar waves emitted by the transmitter of other 5.8G frequency radars; specifically, the radar waves after absorption and the movement of the magnetic fluid are controlled by high frequency, and the radar waves are transferred to the upper part of the cavity and diffused, which can solve the mutual interference problem when the multi-radar transmitter matrix is ​​working. In the present invention, radar wave absorption rate = [(magnetic fluid absorption rate + ferrite particle absorption rate) * magnetic fluid motion coefficient]; magnetic fluid motion coefficient = (magnetic fluid fluctuation frequency * motion range): fluctuation direction.

[0025] Figure 1 , 2 As shown in Figures 3, 4, 5 and 6, through the above technical scheme, the present invention adds an absorption guide module on the back of the radar wave transmitter of the 5.8G frequency radar body, forms a closed control loop through the monitoring of the back radar wave and the electromagnetic controller, and achieves different levels of radar wave absorption effects through the dual-row independent electromagnetic generators in multiple directions, high-frequency control of the magnetic fluid inside the absorption cavity, and the motion state of the ferrite particles, and finally absorbs all the back radar waves and transfers the radar waves to the top of the cavity for diffusion through high-frequency control of the magnetic fluid movement, thereby solving the problem of mutual interference between the transmission and reception of the radar transmitter when multiple 5.8G frequency radar matrices are working, and provides strong technical support for the reliable and effective application of 5.8G frequency radars.

[0026] It should be noted that although the above content has shown and described an embodiment of the present invention, the implementation method does not only include an independent technical solution. This narrative method of the specification is only for the sake of clarity. For ordinary technicians in this field, it can be understood that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principle and spirit of the present invention to form other implementation methods that can be understood by those skilled in the art. Therefore, the scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An electromagnetic wave back absorption device for a 5.8G frequency radar, comprising a DC frequency conversion power supply module, an electromagnetic generator, a cavity, a magnetic fluid, and an electromagnetic controller; characterized in that: Waveguide plates are vertically distributed at the front and rear ends of the cavity, respectively, and a magnetic fluid seal is located in the cavity, in which ferrite particles are mixed; there are multiple sets of electromagnetic generators, which are respectively installed on the left, right, upper and lower parts of the outer side of the cavity, the power output end of the DC frequency conversion power supply module is electrically connected to the power input end of the electromagnetic controller, and the power output end of the electromagnetic controller is electrically connected to the power input ends of the multiple sets of electromagnetic generators; the waveguide plates are cylindrical, and the waveguide plates at the front and rear ends of the cavity are spaced apart from the upper end and the lower end of the cavity respectively; the cavity is made of metal, a 5.8G frequency radar module is fixedly installed at the front end of the outer side of the cavity, and a DC frequency conversion power supply module and an electromagnetic controller are installed in the component box.

2. The electromagnetic wave back-absorbing device for 5.8G frequency radar according to claim 1, characterized in that: The electromagnetic generator comprises an electromagnetic generator iron core and an electromagnetic transmitter winding coil. A plurality of turns of the electromagnetic transmitter winding coil surround the outer end of the electromagnetic generator iron core, and a protective shell is sealed outside the electromagnetic transmitter winding coil.

3. The electromagnetic wave back-absorbing device for 5.8G frequency radar according to claim 1, characterized in that: Each coil of the multiple sets of electromagnetic generators has an independent control module based on a single chip microcomputer, and each control module is controlled by the single chip microcomputer to achieve the control purpose of controlling the electromagnetic generator to generate different magnetic field strengths and directions.

4. The electromagnetic wave back-absorbing device for 5.8G frequency radar according to claim 1, characterized in that: Two sets of electromagnetic generators are respectively installed on the left and right parts and the upper and lower parts of the outer side of the cavity, and the two sets of electromagnetic generators are spaced apart from each other.

5. The electromagnetic wave back-absorbing device for 5.8G frequency radar according to claim 1, characterized in that: The magnetic fluid fills the cavity.

6. The electromagnetic wave back-absorbing device for 5.8G frequency radar according to claim 1, characterized in that: The waveguide plate is arc-shaped and made of graphene.

7. The application method of the electromagnetic wave back absorption device of 5.8G frequency radar according to any one of claims 1 to 6, characterized in that: The invention comprises the following steps: S1: the transmitter of the 5.8G frequency radar emits radar waves when the radar is working; S2: the DC frequency conversion power supply module supplies power to the electromagnetic controller, and the electromagnetic controller controls the high-frequency vibration of the double-row independent electromagnetic generators in four directions, thereby controlling the magnetic fluid and ferrite particles in the cavity to be in a vibrating and moving state, so as to achieve different levels of radar wave absorption effects reflected by the 5.8G frequency radar module; S3: the radar electromagnetic waves are absorbed by the ferrite in the magnetic fluid and bypass the waveguide plate and then guided to the upper part of the cavity, so as to avoid interference with the radar waves emitted by the transmitters of other 5.8G frequency radars.

8. The application method of the electromagnetic wave back-absorbing device of the 5.8G frequency radar according to claim 6 is characterized in that: In step S2, when the power output by the electromagnetic controller is greater, the output power of the electromagnetic generator is greater, and the vibration intensity of the magnetic fluid and ferrite particles is greater, and vice versa, the vibration intensity is smaller.

9. The application method of the electromagnetic wave back-absorbing device of the 5.8G frequency radar according to claim 6 is characterized in that: In step S3, the absorbed radar waves are transferred to the top of the cavity and diffused by controlling the movement of the magnetic fluid through high frequency, thereby solving the mutual interference problem when the multi-radar transmitter matrix is ​​working.

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